Origin of Lagrangian Intermittency in Drift-Wave Turbulence

Details Origin of Lagrangian Intermittency in Drift-Wave Turbulence Origin of Lagrangian Intermittency in Drift-Wave Turbulence

2010-09-28

arxiv.org/abs/1009.5617v1

Physical Review Letters 105 (2010) 145001

Physics

Fluid Dynamics

Scientific paper

10.1103/PhysRevLett.105.145001

The Lagrangian velocity statistics of dissipative drift-wave turbulence are investigated. For large values of the adiabaticity (or small collisionality), the probability density function of the Lagrangian acceleration shows exponential tails, as opposed to the stretched exponential or algebraic tails, generally observed for the highly intermittent acceleration of Navier-Stokes turbulence. This exponential distribution is shown to be a robust feature independent of the Reynolds number. For small adiabaticity, algebraic tails are observed, suggesting the strong influence of point-vortex-like dynamics on the acceleration. A causal connection is found between the shape of the probability density function and the autocorrelation of the norm of the acceleration.

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